Aricidea (Acmira) Hartley 1981

Subgenus Aricidea (Acmira) Hartley, 1981 Type species. Aricidea catherinae Laubier, 1967 Diagnosis: Prostomium subtriangular, pear-shaped to oval, with rounded anterior margin; antenna simple, usually unbranched and unarticulated. Posterior lip of mouth extending through ventral surface of first two chaetigers. Chaetae of three types: limbate in the anterior part, thin capillaries in the post-branchial region, and modified neurochaetae which are heavy, curved spines with or without hood, with or without accessory filaments, teeth or bristles, always thicker than notochaetae and accompanying capillary neurochaetae (Blake, 2019). Key to species of Aricidea (Acmira) of the world. In square brackets is the region where the type locality is contained. 1 Modified neurochaetae with arista....................................................................... 2 - Modified neurochaetae without arista.................................................................... 23 2(1) Modified neurochaetae with hood........................................................................ 3 - Modified neurochaetae without hood.................................................................... 11 3(2) Modified neurochaetae generally with distal pubescence...................................................... 4 - Modified neurochaetae without pubescence................................................................ 8 4(3) Pubescence in most of the modified neurochaetae, distal arista inserted subdistally; median antenna with thin base and inflated, rounded tip, not extending beyond posterior margin of prostomium............................................................................... A. (A.) filamentosa Barroso, Paiva & Ranauro, 2020 [Espírito Santo Basin, Brazil]. - All neurochaetae modified with pubescence; antenna extending beyond posterior margin of prostomium................ 5 5(4) Antenna inserted anteriorly, reaching middle of chaetiger 1, digitiform, with two sub-distal constrictions and rounded distally; last pair of branchiae narrow and long; modified neurochaetae bearing a tuft of distal pubescence and sometimes a short distal arista................................ A. (A.) bbkingi Barroso, Paiva & Ranauro, 2020 [Espírito Santo Basin, Brazil] - Antennae smooth, without constrictions, inserted medially; modified neurochaetae with distal or subdistal arista on convex side of shaft............................................................................................. 6 6(5) Antenna extend back to mid part of first chaetiger, digitiform; notopodial postchaetal lobe short and conical in first two chaetigers; modified neurochaetae with distal arista only seen by SEM........................................................................................... A. (A.) blakei sp. nov. [Bahía de los Angeles, Gulf of California] - Antenna extend back to chaetiger 2 or beyond; notopodial lobe short and cirriform in first two chaetigers............... 7 7(6) Antenna extending to chaetiger 2; digitiform with more or less swollen region above mid-region; notopodial postchaetal lobe in postbranchial segments long, stout, finger-like; with 10–21 pairs of branchiae; modified neurochaetae with distal arista................................................. A. (A.) katzmanni Erdoğan-Dereli & Çinar, 2020 [Sea of Marmara] - Antenna extending to chaetigers 3–6, slightly thicker initially, then tapering, sometimes weakly telescoping then tapering to pointed tip; notopodial lobe in postbranchial segments filiform; with up to 50 pairs of branchiae; modified neurochaeta with subdistal arista on convex side of shaft....... A. (A.) lopezi Berkeley & Berkeley, 1956 [Eastern Pacific, British Columbia] 8(3) Antenna thick, not reaching posterior margin of prostomium; with 28–30 pairs of branchiae, last pair somewhat longer, narrower; modified neurochaetae curved, acicular, with hooked tip bearing 3–4 spines, with subapical hood on concave side of tip......................................................... A. (A.) rubra Hartman, 1963 [off California, USA] - Antenna reaching chaetiger 4........................................................................... 9 9(8) Antenna long (extends back to chaetiger 2–4), slender; with 19–20 pairs of branchiae, last four pairs are noticeably longer than the width of segment, with a slender filamentous tip; notopodial papilla absent; notopodial lobe in first two prebranchial chaetigers short and cirriform............................................ A. (A.) elongata Imajima, 1973 [Japan] 1 - Antenna short (not exceeding chaetiger 2), broad near base or medially; with up to 16 pairs of branchiae; notopodial papilla present............................................................................................ 10 10(9) Antenna with thin base, central part swollen, then thin and cylindrical in its distal part; notopodial postchaetal lobe thick, short, digitiform in first two chaetigers, becoming thicker and longer with weakly asymmetrical basal swelling from chaetiger 3 to branchial region, long and filiform in postbranchial region... A. (A.) catherinae Laubier, 1967 [Mediterranean Sea, France] - Antenna clavate, unequally bifid distally, with small subterminal process; notopodial postchaetal lobe small, spherical in first two chaetigers, more elongate in the third chaetiger, subulated in branchial region, becoming slenderer and cirriform in postbranchial region........................... A. (A.) philbinae Brown, 1976 [East and west coasts of Florida, USA] 11(2) Modified neurochaeta with subterminal pubescence........................................................ 12 - Modified neurochaeta without subterminal pubescence...................................................... 21 12(11) Antenna does not extend beyond the posterior margin of first chaetiger......................................... 13 - Antenna extending to chaetiger 2 or beyond............................................................... 14 13(12) Antenna inserted medially, it reaches back to about the midline of the first chaetiger; notopodial papilla present in first 14 chaetigers; modified neurochaetae with arista inserted medially............................................................................................... A. (A.) laubieri Hartley, 1981 [Smith Bank, Moray Firth, Scotland] - Antenna inserted anteriorly, extending to posterior part of prostomium; notopodial papilla absent; modified neurochaetae with arista inserted distally........................ A. (A.) pseudoassimilis Erdoğan-Dereli & Çinar, 2020 [Sea of Marmara] 14(12) Modified neurochaetae with arista inserted subdistally on convex side.......................................... 15 - Modified neurochaetae with arista or long fibrils inserted basally on convex side................................. 18 15(14) Antenna inserted medially, extended beyond the second chaetiger; neuropodial postchaetal lobe present................ 16 - Antenna inserted distally, extended back to chaetiger 2, moderately inflated in proximal region; neuropodial postchaetal lobe absent; notopodial postchaetal lobe cirriform in prebranchial and branchial region.......................................................................................... A. (A.) bispinata Cantone, 1994 [Ross Sea, Antarctica] 16(15) Notopodial postchaetal lobe with asymmetrical basal enlargement on branchial region. Modified neurochaetae of two types, with or without terminal arista.......................................................................... 17 - Notopodial postchaetal lobes short, thick and cirriform on first two chaetigers; long and thick between chaetiger 3–6; filiform on posterior chaetigers. Modified neurochaetae of three types: type I long, relatively thin, with a strong and thick arista at tip; type II short, thicker than others, with a distal end curving at 90°, fibrils (hirsute) subterminally; type III short, thick, with a curved distal end and a strong arista at tip, hirsute subterminally...... A. (A.) annae Laubier, 1967 [Western Mediterranean] 17(16) Antenna extends back to chaetiger 3–4; with 20–28 pairs of branchiae; modified neurochaetae from chaetiger 20–22; with notopodial papilla.................................................. A. (A.) finitima Strelzov, 1973 [Scotia Sea] 2 - Antenna extends back to chaetiger 6; with 12 pairs of branchiae; modified neurochaetae from chaetiger 28–30; notopodial papilla absent...................................................... A. (A.) mirifica Strelzov, 1973 [Antarctica] 18(14) Neuropodial postchaetal lobe present.................................................................... 19 - Neuropodial postchaetal lobe absent..................................................................... 20 19(18) Antenna extending to posterior margin of chaetiger 1, inserted centrally; neuropodial postchaetal lobe from chaetiger 1–19, short, digitiform anteriorly; short, cirriform posteriorly, does not exceed half the size of the neurochaetae............................................................ A. (A.) meridionalis Laubier & Ramos 1974 [Western Mediterranean] - Antenna extends back to chaetiger 5, inserted distally; neuropodial postchaetal lobe from chaetiger 1–37, slender digitate, as long as the size of the neurochaetae..................................... (A.) (A.) horikoshii Imajima, 1973 [Japan] 20(18) Antenna clubbed, thin in the proximal part, thickening towards the distal part; notopodial postchaetal lobe short, cylindrical in first two chaetigers, long and subulated on chaetiger 3 and branchial chaetigers.................................................................................................... A. (A.) taylori Pettibone, 1915 [Florida, USA] - Antenna long, thin, extends back to chaetiger 3–10; notopodial postchaetal lobe short and cirriform in first two chaetigers, long and thin on chaetiger 3 and branchial chaetigers, with strongly developed