Mangrovia occidentalis, Framenau & Castanheira, 2022
Framenau, Volker W. & Castanheira, Pedro de S., 2022, A new genus of Australian orb-weaving spider with extreme sexual size dimorphism (Araneae, Araneidae), Zoosystematics and Evolution 98 (1), pp. 137-149 : 137
treatment provided by
Mangrovia occidentalis sp. nov.
Holotype male, Cape Range National Park, Yardie Creek (22°20'S, 113°48'E, Western Australia, Australia), 7 July 1987, B. Y. Main ( WAM T77397).
The specific epithet is a Latin adjective in apposition - Mangrovia occidentalis - meaning western, and it refers to its distribution that is limited to coastal Western Australia.
Other material examined.
Australia: Western Australia: 1 female, Bay of Rest , 22°18'S, 114°08'E ( WAM T75793 View Materials ) GoogleMaps ; 1 female, same locality ( WAM T75827 View Materials ) GoogleMaps ; 1 female, 1 juv., Cape Range , 22°10'S, 114°E ( AM KS.62723) GoogleMaps ; 3 juv., Cape Range National Park, Yardie Creek , 22°20'S, 113°48'E ( WAM T157108) GoogleMaps ; 1 female, same locality ( WAM T75322 View Materials ) GoogleMaps ; 1 female, same locality ( WAM T75326 View Materials ) GoogleMaps ; 1 female with eggsac, same locality ( WAM T115115) GoogleMaps ; 1 female, same locality ( WAM T75327 View Materials ) GoogleMaps ; 1 female, Cooke Point, Port Headland , 20°19'S, 118°36'E ( WAM T75325 View Materials ) GoogleMaps ; 2 females, Faure Island, North , 25°48'S, 113°53'E ( WAM T67857 View Materials ) GoogleMaps ; 3 females, Faure Island, West , 25°52'S, 113°53'E ( WAM T67854 View Materials ) GoogleMaps ; 1 female, same locality ( WAM T67855 View Materials ) GoogleMaps ; 1 female, same locality ( WAM T67856 View Materials ) GoogleMaps ; 1 female, Karratha , NW airport, 20°44'S, 116°51'E ( WAM T75840 View Materials ) GoogleMaps ; 1 female, King Sound, Derby Jetty , 16°49'S, 123°28'E ( WAM T75777 View Materials ) GoogleMaps .
See above for Mangrovia albida comb. nov.
Male (based on holotype, WAM T77397): Total length 2.2. Carapace (Fig. 6A View Figure 6 ) 1.0 long, 0.9 wide; light brown with darker lateral flanks; few white setae. Eyes diameter AME 0.09, ALE 0.05, PME 0.08, PLE 0.05; row of eyes: AME 0.29, PME 0.22, PLE 0.50. Chelicerae paturon dark grey; two promarginal teeth, the apical slightly larger, three retromarginal teeth of similar size. Legs (Fig. 6A, B View Figure 6 ) beige with distal parts of femora, tibiae and patellae brown. Leg formula I > II > IV > III; length of segments (femur + patella + tibia + metatarsus + tarsus = total length): I - 1.0 + 0.4 + 0.8 + 0.7 + 0.4 = 3.3, II - 0.9 + 0.3 + 0.6 + 0.9 + 0.4 = 3.1, III - 0.6 + 0.2 + 0.3 + 0.3 + 0.3 = 1.7, IV - 0.8 + 0.3 + 0.5 + 0.5 + 0.4 = 2.5. Labium and endites beige. Sternum (Fig. 6B View Figure 6 ) heart-shaped, yellowish brown, with darker contour. Abdomen (Fig. 6A, B View Figure 6 ) 1.1 long, 1.2 wide; olive-grey with indistinct darker folium pattern; laterally yellowish-brown; ventral olive-brown, four irregular white guanine spots. Pedipalp (Figs 6C, D View Figure 6 , 7A, B View Figure 7 ) length of segments (femur + patella + tibia + cymbium = total length): 0.2 + 0.1 + 0.2 + 0.4 = 0.9; cymbium broad, tegulum and subtegulum well-developed; conductor broadly elongate, basally slightly sclerotised, otherwise fleshy; median apophysis oval with an apical, slightly curved spine-like prong; radix elongate; terminal apophysis well-developed, with rounded distal portion, bent apically; subterminal apophysis originating near the basis of terminal apophysis, thin and sclerotized; embolus basally inflated, otherwise thin, straight and with small subterminal branch.
Female (based on WAM T75326): Total length 10.8. Carapace (Fig. 8A View Figure 8 ) 3.8 long, 3.6 wide; pear-shaped, uniformly reddish-brown; few white setae. Eyes diameter AME 0.25, ALE 0.16, PME 0.18, PLE 0.16; row of eyes: AME 0.65, PME 0.47, PLE 1.64. Chelicerae reddish-brown; four promarginal teeth, second basal largest; three retromarginal teeth of similar size. Legs (Fig. 8A, B View Figure 8 ) reddish-brown. Pedipalp length (femur + patella + tibia + tarsus = total length): 1.2 + 0.6 + 0.9 + 1.5 = 4.2. Leg formula I > IV > II > III; length of segments (femur + patella + tibia + metatarsus + tarsus = total length): I - 4.6 + 2.1 + 3.5 + 3.4 + 1.1 = 14.7, II - 4.0 + 1.8 + 3.1 + 0.9 + 1.0 = 10.8, III - 2.5 + 1.2 + 1.5 + 1.6 + 0.8 = 7.6, IV - 3.8 + 1.6 + 2.3 + 2.9 + 0.9 = 11.5. Labium and endites reddish-browns. Sternum (Fig. 8B View Figure 8 ) heart-shaped, reddish-brown with two small lighter patches along the median line. Abdomen (Fig. 8A, B View Figure 8 ) 6.5 long, 6.3 wide; dorsally beige, with a black band along anterior margin; four pairs of dark brown sigillae; venter olive-brown, with transverse guanine band posterior of epigastric furrow, somewhat lighter anterior of spinnerets and two small white spot antero-lateral of spinnerets. Epigyne (Figs 4B View Figure 4 , 8C-E View Figure 8 ) almost twice as wide as long, copulatory openings laterally of scape; scape almost twice as long as epigyne plate, narrow, basally and apically wider, and with terminal pocket. Spermathecae ovoid; fertilisation ducts basally convoluted and attaching posteriorly to spermathecae (Fig. 4B View Figure 4 ).
Male only known from holotype; the spine on the median apophysis of the left pedipalp was broken off, therefore the right pedipalp is illustrated here. Female total length 8.7-10.6 (n = 8); there was little colour variation in females although the abdomen venter showed distinct white guanine spots in most specimens.
Habitat preferences and life history.
Collection data on labels with museum specimens of M. occidentalis sp. nov. exclusively lists ‘mangroves’ as habitat, where, similar to M. albida comb. nov., spiders were collected mainly from rolled leaves near the orb-web. Mature spiders were mainly collected in May, July and September with a single record in February.
This species is only known from coastal Western Australia (Fig. 9 View Figure 9 ).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.