Munida galalala, McCallum & Ahyong & Andreakis, 2021

McCallum, Anna W., Ahyong, Shane T. & Andreakis, Nikos, 2021, New species of squat lobsters of the genus Munida from Australia, Memoirs of Museum Victoria 80, pp. 113-152 : 119-121

Munida galalala sp. nov.

http://zoobank.org/urn:lsid:zoobank.org:act:83168BC4-60EA-

4710-A32B-42AAFFF985CA

Figures 4, 5

Type material. Holotype. WAM C78558 , male (cl 17.8 mm, pcl 11.5 mm), Western Australia, Leveque L 27 transect, 14° 33.432' S, 121° 20.388' E to 14° 2.772' S, 121° 19.644' E, 924–1101 m, SS05/2007/156, 3 July 2007 to 4 July 2007.

Description. Carapace. Length 1.1 × greatest width, widest at midlength. Dorsal surface with main transverse ridges mostly uninterrupted and some short secondary transverse striae between main ridges on anterior half; ridges and striae lined with short, non-iridescent setae. Gastric region slighly elevated, with 2 pairs of epigastric spines, longest pair behind supraocular spines. Hepatic region granular; parahepatic spine absent. Anterior part of branchial region between cervical groove and postcervical groove with few short scale-like ridges and tubercles; postcervical spine absent; posterior part of branchial region with 5 main transverse ridges (excluding posterodorsal ridge) and few short secondary striae laterally between main ridges. Cardiac region with 4 main transverse ridges. Intestinal region with short median stria; posterodorsal ridge distinct, slightly convex medially, without secondary stria. Frontal margin inclined posteriorly at 110° from midline. Lateral margins slightly convex; anterolateral spines parallel, horizontal, reaching sinus between rostrum and supraocular spine; marginal hepatic spine anterior to cervical groove also strong, although distinctly shorter than anterolateral spine; branchial margin with 5 spines. Rostrum spiniform, gentle curving upwards, length 0.7 pcl; supraocular spine 0.45 × length of rostrum. Epistomial ridge curved ending anterior to antennal gland; mesial protuberance distinct.

Thoracic sternum. Surface smooth, without striae. Sternite 3 0.4 width of sternite 4; median length of sternal plastron (sternites 4–7) 0.6 width of sternite 7. Sternite 4 anterior margin subtrapezoid, broadly contiguous with sternite 3.

Abdomen. Somite 2 with 7 prominent spines along anterior transverse ridge. Somites 2–4 each with 1 uninterrupted stria behind anterior ridge, without striae at lateral margins. Somite 6 posteromedian margin almost straight. Telson with numerous transverse squamae; greatest width 1.5 × median length; anterolateral margin concave.

Eye. Maximum corneal diameter 0.15 × distance between anterolateral spines.

Antennule. Basal article (distal spines excluded) overreaching corneae; well-developed distolateral spine much longer than short distomesial spine; 2 lateral spines, proximal smaller, not exceeding distal spines.

Antenna. Article 1 with strong distomesial spine not reaching distal margin of article 2. Article 2 distomesial spine not overreaching distal margin of article 3; distolateral spine reaching distal margin of article 3. Article 3 distomesial spine almost reaching distal margin of article 4. Article 4 unarmed.

Maxilliped 3. Ischium 1.3 × merus length, with small flexor distal spine. Merus with 2 large spines on flexor margin and 1 small spine; extensor margin unarmed.

P1. 3.0 × pcl, covered in plumose setae, without iridescent setae, merus 1.2 × pcl, with row of 6 dorsal spines and 2 rows of spines on mesial margin; distal spines strong, distomesial spine not reaching midlength of carpus. Carpus 0.6 × merus length, length 2.6 × width, with spines along mesial and dorsal margins. Propodus 1.2 × merus length, fingers slightly shorter than palm, 0.5 × total propodus length; pollex with small subdistal spine, margin unarmed; dactylusouter margin unarmed.

P2–4. Moderately long, slender, with numerous scales on lateral surfaces of meri; extensor margin with row of plumose setae. P2 length 2.1 × pcl; merus as long as pcl, length 7× height, 3.5 × carpus length and 1.4 × propodus length, with well-developed spines on extensor margin, increasing in size distally, flexor margin with row of small spines and well-developed distal spine; carpus with large spine and distal spine on extensor margin, distal spine on flexor margin; propodus length 6.5 × height, with 5 small movable flexor spines; dactylus compressed, slightly curved, 0.6 × propodus length, length 5.5 × width, with 9 movable spines evenly spaced along flexor margin including spine at base of unguis. End of P2 carpus reaching end of P1 merus. P3 missing. P4 length 0.8 × P2 length; merus 0.7 × pcl; merocarpal articulation almost reaching hepatic marginal spine of carapace.

Genetic data. COI and 16S; see Table 1.

Etymology. Named galalala , meaning lobster in Dambimangari language, used as a noun in apposition.

Remarks. Munida galalala sp. nov. belongs to the group of species having five spines on the lateral branchial margins of the carapace, smooth thoracic sternites, small eyes, and spines on the anterior ridge of abdominal somite 2. The antennal peduncle is most similar to Munida parvioculata Baba, 1982 , both species having a distinct distomesial spine on antennal peduncle article 3. The new species differs in:

- the generally smooth surface of the carapace with widely spaced transverse striae, compared to rugose with interrupted transverse ridges in M. parvioculata

- the unarmed lateral margin of the cheliped pollex (with 2 spines in M. parvioculata )

- a row of 7 spines on abdominal somite 2 versus a single pair in M. parvioculata .

Munida galalala can be distinguished from all other species in this group (i.e. M. clevai Macpherson, 2009 , M. ampliantennulata Komai, 2011 , M. profunda Macpherson and de Saint Laurent, 1991 , M. endeavourae Ahyong and Poore, 2004 , M. pollioculus Komai and Higashiji, 2016 , and M. typhle Macpherson, 1994 ) by the presence of a spine on antennal peduncle article 3.

Distribution. Presently known only from off north-western Australia, 924–1101 m.

Figures

Figure 5. Munida galalala sp. nov., holotype, male 17.8 mm (WAM C78558): A, left P2 dactylus, lateral view; B, left P2, lateral view; C, left P4, lateral view; D left maxilliped 3, lateral view. Scale A = 1 mm, B–D = 2 mm