Sadayoshia savali, Macpherson, Enrique & Baba, Keiji, 2012

Macpherson, Enrique & Baba, Keiji, 2012, The squat lobsters of the genus Sadayoshia Baba, 1969 (Crustacea: Decapoda: Anomura: Munididae): new records including six new species from the Pacific Ocean, Zootaxa 3589, pp. 30-48 : 43-47

Sadayoshia savali n. sp.

( Figs. 6 , 7 F)

Sadayoshia inermis Macpherson & Baba 2010: 428 (in part, some specimens from New Caledonia and Vanuatu).

Sadayoshia tenuirostris Macpherson & Baba 2010: 444 (in part, some specimens from New Caledonia and Vanuatu).

Material examined. Holotype: New Caledonia, Lagoon Est. Stn DW692, 21º32'S, 166º12.3'E, 44–48 m, August 1986: 1 3 6.0 mm (MNHN-IU-2010-5362).

Paratypes: New Caledonia, Lagoon Est. Stn DW635, 21º57.7'S, 166º44.5'E, 45–52 m, August 1986: 1 3 5.0 mm, 1 Ƥ 4.1 mm, 1 Ƥ broken (MNHN-IU-2010-5357).—Stn DW639, 21º55.5’S, 166º44.1’E, 50 m, August 1986: 1 3 4.2 mm, 1 Ƥ 4.0 mm (MNHN-IU-2010-5358).—Stn DW651, 21º48.0'S, 166º36.4'E, 48 m, August 1986: 1 3 4.7 mm (MNHN-IU-2010-5359).—Stn DW657, 21º48.2'S, 166º33.8'E, 40–42 m, August 1986: 1 3 4.8 mm, 1 ov. Ƥ 5.5 mm, 1 F 3.7 mm (MNHN-IU-2010-5360).—Stn DW671, 21º38.1'S, 166º25.5'E, 36–39 m, August 1986: 1 3 6.2 mm (MNHN-IU-2010-5361).

New Caledonia, Lagoon. Stn DW247, Ouen Island, Prony Bay, 22º24'S, 166º51'E, 43 m: 1 3 5.6 mm, 3 ov. Ƥ 4.3–5.6 mm (MNHN-IU-2010-5356).

New Caledonia, Lifou Island. LIFOU. Stn 1450, 20º45.8'S, 167º01.65'E, 27–31 m, 21 November 2000: 3 3 3.5-3.6 mm, 4 ov. Ƥ 3.9–6.1 mm, 1 Ƥ 2.6 mm (MNHN-IU-2010-5368),(MNHN-IU-2010-5369).—Stn 1466, 20º46.5'S, 167º06.2'E, 25–45 m, 17 November 2000: 2 3 2.9–3.7 mm, 5 ov. Ƥ 3.6–4.4 mm, 1 Ƥ 2.2 mm (MNHN- IU-2010-5370, MNHN-IU-2010-5371).

Vanuatu. SANTO. Stn DB77, 15°27.9'S, 167°14.7'E, 42–45 m, 29 September 2006: 1 3 3.1 mm, 1 ov. Ƥ 3.6 mm (MNHN-IU-2010-5367, MNHN-IU-2010-5366).—Stn FB47-49, 15°32.4'S, 167°12.7'E, 45–50 m, 02-03 October 2006: 1 3 3.9 mm, 1 Ƥ 2.8 mm (MNHN-IU-2010-5364, MNHN-IU-2010-5365).—Stn EP34, 15°33.3'S, 167°12.9'E, 14 October 2006, 40– 60 m: 1 ov. Ƥ 3.8 mm (MNHN-IU-2010-5363).

Etymology. The name savali refers to the messenger of Tagaloa (the Creator) in the Samoan mythology. The name is considered as a substantive in apposition.

Description. Carapace: As long as broad; dorsal surface nearly horizontal from anterior to posterior; cervical groove distinct. Dorsal surface with 4 pairs of epigastric spines, 1 parahepatic, 1 anterior branchial and 1 postcervical spine on each side; ridges with short setae and scattered long iridescent setae. Gastric region with scale-like ridge directly behind epigastric spines, followed by 5 uninterrupted ridges, additional scale-like ridge near cervical groove, and a few scattered scales between ridges. Mid-transverse ridge of carapace uninterrupted, preceded by cervical groove; lateral part of posterior branchial region with 6 ridges (exclusive of mid-transverse ridge and posteriormost transverse ridges directly anterior to posterior margin of carapace). Lateral margins slightly convex, with 7 spines. Rostrum 1.4 times as long as broad, length 0.5 that of carapace, dorsal surface flattish, with short setiferous striae, nearly horizontal in lateral view; rostral spine less than 2.5 times as long as wide (measured at sinus between rostral and anterior lateral spines). Pterygostomian flap rugose with sparse setae, anterior margin ending in acute point.

Sternum: Sternal plastron as long as broad, lateral limits divergent posteriorly. Sternite 3 1.8 times as broad as long; anterior margin strongly convex, with small median notch. Sternite 4 1.5 times longer and 2.5 times broader than preceding sternite, 3.5 times broader than long; surface with 2 medially interrupted transverse ridges. Following sternites smooth, with only a few scale-like ridges on sternite 5. Lateral parts of sternite 7 without granules.

Abdomen: Somite 2 unarmed; somites 2–3 each with 4 tranverse ridges, first and third uninterrupted, second and fourth interrupted, fourth often obsolete; with scattered long iridescent setae.

Eyes: Peduncles about 1.3 times longer than broad; cornea moderately dilated, maximum corneal diameter 0.4 times distance between bases of anterolateral spines; eyelashes short, not reaching midlength of cornea.

Antennule: Article 1 with 4 distal spines: mesial and medioventral smaller than mediodorsal, lateral spine clearly longer than others; lateral margin unarmed; ventral surface with a few short scales.

Antenna: Article 1 with distomesial spine reaching distal margin of article 2. Article 2 with distolateral spine slightly larger than distomesial spine, terminating in midlength of article 3. Articles 3 and 4 unarmed.

Mxp3: Ischium with obsolescent distal spine on flexor margin; extensor margin distally angular; crista dentata with 27–29 denticles. Merus subequal in length to ischium, with 2 spines on flexor margin, distal one terminal, proximal one slightly stronger than distal one; extensor margin unarmed. Carpus unarmed.

P1: 1.8 times carapace length, relatively stout, with scattered long uniramous iridescent setae along lateral and mesial margins of merus, palm and fingers; dorsal and ventral surfaces of palm and fingers with short setae. Merus 0.7 times length of carapace, 2.2 times as long as carpus, with strong distal spines on dorsal and mesial margins, and a few additional spines on distal part of dorsal surface. Carpus 0.8 times length of palm, 0.8 times as long as broad, lateral and mesial margins subparallel, dorsal surface with small spines; mesial surface with well-developed spines placed dorsally and ventrally. Palm 0.8 times as long as broad; lateral and mesial margins with rows of spines continued on to fixed and movable fingers, respectively. Fingers distally spooned; movable finger 1.5 times longer than palm.

P2–4: Somewhat compressed mesio-laterally, sparsely covered with long uniramous iridescent setae and short plumose setae. Meri successively shorter posteriorly, equally broad on P2–4; P2 merus 0.6 times carapace length, 3.6 times as long as broad, 1.3 times longer than P2 propodus; P3 merus 1.3 times length of P3 propodus; P4 merus 1.1 times length of P4 propodus; dorsal margins with row of proximally diminishing spines on P2 and P3, nearly unarmed on P4; dorsolateral surface unarmed on P2 and P3, with 2 spines on P4; ventrolateral margins with strong terminal spine. Carpi with 4 or 5 spines on extensor margin of P2 and P3 (distalmost largest), unarmed on P4; lateral surface with 1 or 2 small spines; flexor margins with distal spine. Propodi successively shorter posteriorly, 3.7–3.9 times as long as broad; extensor margin with 1 or 2 proximal spines; flexor margin with 8–10 slender movable spines. Dactyli subequal in length, 0.8–0.9 times length of propodi, ending in incurved, strong, sharp spine; flexor margin with 8 or 9 seta-like movable spines, each arising from low tooth.

Remarks. Sadayoshia savali belongs to a group of species having the antennular article 1 without a lateral marginal spine and the sternite 3 at most twice as broad as long. This group includes S. inermis Macpherson & Baba 2010 , S. tenuirostris Macpherson & Baba 2010 and S. savali .

Sadayoshia savali and S. inermis both have a thick rostral spine less than 3 three times as long as wide (measured at the sinus between rostral and anterior lateral spines). However, S. savali can be easily distinsguished from S. inermis by the presence instead of absence of a pair of postcervical spines on the carapace.

Sadayoshia tenuirostris also bears the postcervical spines on the carapace. However, the rostral spine is very thin, being more than 3.5 times longer than wide, whereas this spine is less than 2.5 times longer in S. savali .

Distribution. Vanuatu, New Caledonia, Lifou Island, between 5 and 60 m.

Figures

FIGURE 6. Sadayoshia savali n. sp., holotype, male, 6.0 mm, New Caledonia, Lagoon Est. Stn DW 692 (MNHN-IU- 2010 - 5362). A, carapace and abdomen, dorsal view; B, sternal plastron, sternites 3 and 4; C, left cephalic region, showing antennular and antennal peduncles, ventral view; D, right Mxp 3, lateral view; E, right P 1, dorsal view; F, right P 2, lateral view; G, right P 3, lateral view; H, right P 4, lateral view. Scale: A, F – H = 1 mm; B – D = 0.5 mm; E = 2 mm.

FIGURE 7. Rostrum, dorsal view. A, Sadayoshia acamar n. sp., ovigerous female, 5.0 mm, Chesterfield Islands, CHALCAL 1984, Stn DC 45 (MNHN-IU- 2010 - 5378). B, S. actaea n. sp., holotype, female, 3.2 mm, Lifou Island. LIFOU, Stn 1467 (MNHN-IU- 2010 - 5372). C,. S. adaro n. sp., ovigerous female, 3.9 mm, Solomon Islands. SALOMON 1, Stn DW 1744 (MNHN-IU- 2010 - 5376). D, S. aludra n. sp., ovigerous female, 9.1 mm, Chesterfield Islands. CORAIL 2, Stn DW 106 (MNHN-IU- 2010 - 5353). E, S. moorei n. sp., holotype, ovigerous female, 4.1 mm, French Polynesia, Society Islands (UF 16050) F, S. savali n. sp., ovigerous female, 5.4 mm, Lifou Island, Stn 1450. Scale = 1 mm.