Munida maatijadakurnaaku McCallum, Ahyong & Andreakis, 2021, sp. nov.
Creators: name: McCallum, Anna W.
name: Ahyong, Shane T.
name: Andreakis, Nikos
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Munididae
Munida
Munida maatijadakurnaaku

description: Munida maatijadakurnaaku sp. nov.   
http://zoobank.org/urn:lsid:zoobank.org:act:354E2119-60D1-  
498B-9595-32D05B1968BF  
Figures 14, 15  
 Munida aff. rubiesi Macpherson, 1991. — Poore et al., 2008.   
 Type material. Holotype: WAM C78564, male (rostrum broken; pcl 9.0 mm), Western Australia, south-west of Kalbarri, 27° 56.106' S 113° 4.86' E to 27° 56.646' S 113° 5.28' E, 417–428 m, beam trawl, SS10/2005/98, 4 December 2005.   
 Description. Carapace. Length 1.2 × greatest width, widest at midlength. Dorsal surface with numerous uninterrupted transverse ridges and secondary transverse striae between main ridges; ridges and striae lined with short, non-iridescent setae and scattered long setae. Gastric region with 4 pairs of epigastric spines, longest pair behind supraocular spines. Hepatic region with short scales; parahepatic spine present. Anterior part of branchial region between cervical groove and postcervical groove with dorsal spine and 5 or 6 main ridges; 1 postcervical spine; posterior part of branchial region with 8 main transverse ridges (excluding posterodorsal ridge) and 5 secondary striae laterally between main ridges. Cardiac region with 5 main transverse ridges. Intestinal region with 2 transverse ridges, posterodorsal ridge distinct, with secondary stria. Frontal margin inclined posteriorly at 106° from midline. Lateral margins slightly convex; anterolateral spine slightly divergent, horizontal, overreaching sinus between rostrum and supraocular spine; hepatic marginal spine distinctly smaller than anterolateral spine; branchial margin with 5 spines. Rostrum broken; supraocular spines 0.4 × pcl, exceeding eyes. Epistomial ridge straight ending slightly anterior to antennal gland; mesial protuberance distinct.   
Thoracic sternum. Sternal surface smooth, sternites 4 and 5 with few short striae. Sternite 3 0.4 × width of sternite 4; median length of sternal plastron (sternites 4–7) 0.7 × width of sternite 7. Sternite 4 anterior margin subtriangular, narrowly contiguous with sternite 3.  
Abdomen. Somite 2 with 5 pairs of spines on anterior transverse ridge. Somites 2–4 each with 5 or 6 uninterrupted striae behind anterior ridge. Somite 6 posteromedian marginslightly convex, posterolateral margins slightly produced. Telson with numerous transverse squamae; greatest width 1.6 × median length; anterolateral margin slightly concave.  
Eye. Maximum corneal diameter 0.4 × distance between anterolateral spines.  
Antennule. Basal article (distal spines excluded) overreaching corneae; 2 long, subequal distal spines; 2 lateral spines, proximal smaller, distolateral spine not exceeding distal spines.  
Antenna. Article 1 with distomesial spine overreaching distal margin of article 2. Article 2 with strong distomesial spine significantly overreaching distal margin of article 4; distolateral spine reaching distal margin of article 3. Articles 3 and 4 unarmed.  
Maxilliped 3. Ischium 1.5 × merus length, with strong flexor distal spine; merus with strong spine on flexor margin and small spine distally, without spine on distal extensor margin.  
P1. Length 2.8 × pcl, with long plumose setae and iridescent setae, setae longest on dorsal surfaces. Merus length 1.1 × pcl, with a row of 8 dorsal spines and row of 4 spines on mesial margin; distal spines strong, distomesial spine not reaching midlength of carpus. Carpus 0.4 × merus length, length 1.9 × width. Propodus 1.1 × merus length, fingers 0.6 × total propodus length; pollex with row of 5 spines on lateral margin; dactylus with row of 3 spines on dorsal margin, 5 spines on lateral margin and 1 small subdistal spine.  
P2–4. Long, slender, with numerous scales on lateral sides of meri; extensor margins with row of plumose and iridescent setae. P2 length 2.3 × pcl, merus as long as carapace, length about 7 × height, 4.0 × carpus length and 1.9 × propodus length, row of spines on extensor margin, flexor margin row of spines and well-developed distal spine; carpus with 2 small spines and 2 large spines on extensor margin, distal spine on flexor margin; propodus length 5.3 × height, with 9 small movable flexor spines; dactylus compressed, almost straight, as long as propodus length, length 8.6 × height, with 7 movable spines along the flexor margin, distal one-quarter unarmed. P3 with similar spination and article proportions as P2; merus slightly shorter than P2 merus (0.75); propodus and dactylus slightly shorter than those of P2. P4 length 0.6 × P2 length; merus 0.4 × pcl, length 0.6 × P3 merus length; propodus 0.8 and dactylus 0.9 × as long as those of P3.  
 Etymology. Named maatijada for crawling and kurnaaku for crayfish/yabbie in Nhanda language at the Nhanda Language Day (2 July 2019) at Bundiyarra-Irra Wanga Language Centre in Geraldton; used as a noun in apposition.   
 Remarks. Despite the broken rostrum in the holotype, Munida maatijadakurnaaku sp. nov. is clearly distinguished by a number of diagnostic characters. It is most similar to M. aequalis Ahyong and Poore, 2004, from eastern Australia, which also has long and subequal distal spines on the basal antennular article, a subtriangular sternite 4, slender P2–4 dactyli and similar antennal spination. The two species can be distinguished by:   
 - the supraocular spines overreach the eyes in M. maatijadakurnaaku but do not reach the end of the eyes in M. aequalis   
 - antennal article 2 has the distomesial spine significantly overreaching article 4 in M. maatijadakurnaaku, but only slightly overreaching article 4 in M. aequalis   
 - the P2–4 dactyli are as long as their respective propodi in the new species, with only the distal one-quarter unarmed, rather than slightly shorter than the propodus and unarmed on the distal one-third in M. aequalis.   
 Distribution. Known only from Western Australia, 417– 428 m.
description: Published as part of McCallum, Anna W., Ahyong, Shane T. & Andreakis, Nikos, 2021, New species of squat lobsters of the genus Munida from Australia, pp. 113-152 in Memoirs of Museum Victoria 80 on page 134, DOI: 10.24199/j.mmv.2021.80.06, http://zenodo.org/record/12214129