Armandia garretti

Magalhães, Wagner F., Rizzo, Alexandra E. & Bailey-Brock, Julie H., 2019, Opheliidae (Annelida: Polychaeta) from the western Pacific islands, including five new species, Zootaxa 4555 (2), pp. 209-235: 211-215

publication ID

https://doi.org/10.11646/zootaxa.4555.2.3

publication LSID

lsid:zoobank.org:pub:A7CF86E1-C763-4082-B1C2-9B8B66428142

persistent identifier

http://treatment.plazi.org/id/03E5E958-FFD5-9162-62CF-FEEAFB6AFB6F

treatment provided by

Plazi

scientific name

Armandia garretti
status

sp. nov.

Armandia garretti  sp. nov.

Figures 1View FIGURE 1 (A–C), 2 (A–D), 3 (A–C) and 4 (A–E)

Material examined. Holotype: Hawaii: Pearl Harbor, Waiau discharge: 21°23'15.63" N, 157°57'38.39" W, shallow subtidal, July/13/1999, coll. R. Brock ( BPBM-R3881)GoogleMaps  ; Paratypes: same place, date and collector as holotype (8 spms, BPBM-R3882). Additional material: Pearl Harbor, Waiau discharge: 21°23'15.63" N, 157°57'38.39" W, shallow subtidal, July/13/1999, coll. R. Brock (2 spms on SEM stub); Pearl Harbor, Oahu, #2, discharge at Waiau Generating Station , 21°23'15.63" N, 157°57'38.39" W, shallow subtidal, June /2013, coll. R. Brock (82 spms). Maunalua Bay , Oahu, among branches of the invasive green alga Avrainvillea amadelpha  , intertidal depths, 21°16'49.4" N, 157°43'48.5" W, coll. W. Magalhães and B. Dugan, Mar /2010: Sta. A 4R3 (5), Sta. A 4R2 (3); Sta. A 1R1 (3); Sta. A 1R4 (2); Sta. S 2R2 (3); Sta. S 1R3 (3); Sta. S 3R1 (7); Sta. A 10R1 (5); Sta. A 7R1 (1); Sta. S 1R2 (2); Sta. A 4R3 (5); Sta. A 2R3 (1). Kaneohe Bay : Coconut Island beach, Aug /1983, coll. J. Bailey-Brock (2); Kokokahi, fringing reef north of Likeke place, 0-2 mGoogleMaps  , May/23/2017, coll. IZ team and G. Paulay (1, UF 005392View Materials). EMAP Hawaii 2006, Sta. 65, Kahoiawa Bay , Big Island , 19°48'13.20" N, 156°00'53.04" W, Aug /2006, 9 m, coral/sandy bottom (many); Sta. 19, Keawanui Bay , Big Island , 20°06'48.30" N, 155°53'07.74" W, Aug /2006, 9 m, coral/sandy bottom (5); Sta. 39, Kawaihae Bay , Big Island , 19°59'14.16" N, 155°50'12.06" W, Jul /2006, 20 m, coral/sandy bottom (10); Sta. 30, Kaneohe Bay , Oahu , 21°28'29.64" N, 157°48'09.36" W, Jul /2006, 2 m, coral/sandy bottom (2); Sta. 57, Hapuna Bay , Big Island , 19°59'38.70" N, 155°49'43.26" W, Jul /2006, 8 m, coral rubble (1); Sta. 54, Kaneohe Bay , Oahu , 21°25'00.18" N, 157°47'04.80" W, Sep /2006, 6 m, mud (8). NCCA Hawaii 2010, Sta. 0 7, Kaneohe Bay, Oahu, 21°27'02.04" N, 157°48'48.06" W, 1 mGoogleMaps  (3).

Diagnosis. Parapodia biramous, symmetrical, with parapodial prechaetal lobe, ventral lobe, and dorsal cirrus. Anal tube funnel-shaped, slightly longer than wide with 12–14 transversal striations; up to four pairs of marginal papillae of similar length, digitiform; one internal, unpaired ventral anal cirrus, crenulated and short; one pair of digitate basal papillae.

Description. Holotype 8.2 mm long, 0.4 mm wide for 28 chaetigers. Paratypes 5.5–7 mm long, 0.4 mm wide for 27–28 chaetigers. Body slender, slightly tapering towards anterior and posterior ends ( Fig. 4AView FIGURE 4). Prostomium conical, excluding palpode, longer than wide; palpode as long as 1/3 prostomial length, clavate ( Figs 1AView FIGURE 1; 2AView FIGURE 2; 4BView FIGURE 4). A pair of black eyes deeply and ventrally embedded in prostomium and third eyespot on dorsal side, also embedded in prostomium ( Figs 1AView FIGURE 1; 2AView FIGURE 2). A pair of ring-shaped nuchal organs present ( Figs 2AView FIGURE 2; 4BView FIGURE 4); pharynx conical and lacking oral tentacles ( Fig. 1AView FIGURE 1). Branchiae present from chaetigers 2–26 on holotype and absent on last 2–3 chaetigers on paratypes; branchiae long, approaching dorsal midline but not meeting dorsally ( Figs 2AView FIGURE 2; 4A, BView FIGURE 4); last 2–3 branchiae shorter and last pair of branchiae significantly shorter than preceding one; branchiae without pigmentation.

Parapodia biramous, symmetrical, with parapodial prechaetal lobe, ventral lobe, and dorsal cirrus ( Figs 2DView FIGURE 2; 4CView FIGURE 4); chaetiger 1 with quadrangular parapodial prechaetal lobe and minute ventral lobe; from chaetiger 2 to posterior end, prechaetal lobe become more conical and ventral lobe rounded and more distinct from parapodial bundle; dorsal cirrus minute, from chaetiger 2 and absent on last chaetigers. Simple capillary chaetae in two bundles; notochaetae about three times longer than neurochaetae; 6–8 anteriorly and reducing to 4–6 posteriorly; notochaetae slightly longer than branchiae when branchiae is best developed ( Fig. 4CView FIGURE 4) and longer than branchiae posteriorly. Neurochaetae six capillaries anteriorly and 4–6 posteriorly. Noto- and neuropodial capillaries of last five chaetigers of same length and longer than preceding chaetigers. Lateral eyespots anterior to parapodia 7 on 11 chaetigers (chaetigers 7–17), black, usually rounded; eyespots of chaetiger 7 and 17 of about a third the size of others, also rounded.

Anal tube funnel-shaped, slightly longer than wide, as long as last 2–3 chaetigers and with 12–14 transversal striations ( Figs 1B, CView FIGURE 1; 2B, CView FIGURE 2; 4D, EView FIGURE 4). Posterior border provided with up to four pairs of marginal papillae of similar length, digitiform, about ¼ in length of anal tube ( Figs 1B, CView FIGURE 1; 2B, CView FIGURE 2; 4D, EView FIGURE 4); an internal, unpaired ventral anal cirrus present, thick at base and attached ventrally where ventral incision starts, forming triangular shaped mark ( Fig. 2CView FIGURE 2); unpaired ventral cirrus crenulated and short, projecting outwardly ( Figs 2B, CView FIGURE 2; 3CView FIGURE 3; 4D, EView FIGURE 4). A pair of basal papillae present, longer and thicker than marginal papillae, digitate ( Figs 1B, CView FIGURE 1; 2B, CView FIGURE 2; 3CView FIGURE 3; 4D, EView FIGURE 4).

Description of juveniles. Individuals with juvenile characteristics had 15–25 chaetigers. Juveniles with up to 20 chaetigers lacked prostomial palpode, branchiae and had the pygidium with distinct and bulbous pair of basal cirri and still developing anal tube ( Fig. 3AView FIGURE 3). Prostomial palpode observed in individuals with 24–25 chaetigers ( Fig. 3BView FIGURE 3). One individual with 24 chaetigers had branchiae from chaetigers 3 to 11; branchiae short and digitate. Another juvenile with 25 chaetigers had branchiae from chaetiger 2 and lacked only on last six chaetigers. Anal cone start developing with a short tube bearing a pair of basal cirri with several minute papillae ( Fig. 3CView FIGURE 3). Prostomial palpode and unpaired crenulate anal cirrus present in juveniles with 25 chaetigers. Prostomial palpode originates from a slit on the dorsal part of the prostomium and individuals with 20 chaetigers already had developed slit but lacked palpode ( Fig. 3BView FIGURE 3). Development of prostomial palpode, branchiae and anal cone seem to be simultaneous.

Remarks. Armandia garretti  sp. nov. is most similar to Armandia maculata  from Bermuda, Armandia intermedia  from Senegal and Armandia paraintermedia  from Lizard Island in regards to the shape of the anal cone with a deep ventral incision and shape of the anal papillae. Uebelacker (1984) described specimens of A. maculata  from the Gulf of Mexico having marginal anal papillae digitiform to filiform ranging from none to 14 pairs, basal anal papillae were not described and the unpaired anal cirrus long and crenulate. Armandia garretti  sp. nov. had always four pairs of digitiform marginal anal papillae, one pair of distinct basal anal papillae, elongate and thicker than marginal papillae and a short and crenulate unpaired anal cirrus. Armandia paraintermedia  and A. garretti  sp. nov. differ from A. intermedia  on the number of segmental eyes (11 pairs in both A. garretti  sp. nov. and A. paraintermedia  and 13 pairs in A. intermedia  ) and absence of a parapodial dorsal cirrus in A. intermedia  . Armandia garretti  sp. nov. differs from A. paraintermedia  in relation to the size of the segmental eyes (smaller pairs in chaetigers 7 and 17 in A. garretti  sp. nov. and chaetigers 16 and 17 in A. paraintermedia  ), number of marginal anal papillae (3 pairs in A. parantermedia  and 4 pairs in A. garretti  sp. nov.), shape of prechaetal lobe (conical in A. garretti  sp. nov. and asymmetrical in A. paraintermedia  ), and shape and length of the unpaired anal cirrus being short and crenulate in A. garretti  sp. nov. and long and smooth in A. paraintermedia  .

Etymology. This species is named after Garrett Lynch, a marine biologist, stomatopod enthusiast, lab mate and friend of the authors (W.F.M. and J.H.B-B.), who has helped collecting many polychaetes on the south shore of Oahu, including samples of this new species from Maunalua Bay.

Distribution. The type locality is Pearl Harbor (Oahu). This species has been collected at several localities on Oahu (Pearl Harbor, Maunalua Bay, Kaneohe Bay) and Big Island (Keawanui, Kawaihae, Hapuna, and Kahoiawa bays) from intertidal to 20 m in mud, sand, and coral rubble.

Armandia garretti  sp. nov. is abundant throughout several stations sampled in Pearl Harbor, Hawaii (J.H.B-B. and R. Brock personal observation). Juvenile individuals were caught on the 0.25 mm sieve in February, July, November and December indicating that this species probably reproduces throughout the year.

IZ

Instituto de Zoologia

UF

Florida Museum of Natural History- Zoology, Paleontology and Paleobotany