Mesokalliapseudes macsweenyi Drumm, 2003

DRUMM, DAVID T. & HEARD, RICHARD W., 2011, Systematic revision of the family Kalliapseudidae (Crustacea: Tanaidacea), Zootaxa 3142 (1), pp. 1-172 : 136-139

Mesokalliapseudes macsweenyi Drumm, 2003

(Figs 91–92)

Kalliapseudes sp. A McSweeny, 1968: 28–40 , Figs. 1–7; Rakocinski et al., 1991: 693; 1996 et al.: 351; 1997 et al.: 1290; 1998 et al.: 358; 2000 et al.: 24, 27.

Kalliapseudes aliciae . Messing and Dodge, 1997: 3, 8, 18, 26, 28 (nomen nudum).

Kalliapseudes (Mesokalliapseudes) macsweenyi Drumm, 2003: 1–12 , Figs. 1–5; Guţu, 2006: 142, 158.

Alokalliapseudes macsweenyi Guţu, 2006: 158–161 , Figs. 253–261; Drumm and Heard, 2010: 29, Figs. 1–3.

Type material. Holotype female with oostegites ( USNM 1016972 ), allotype adult male ( USNM 1016973 ), paratypes ( USNM 1016974 , 5 females with oostegites and 5 adult males).

Material examined. Coastal and near shore sites: Paratypes ( USNM 1016974 , 5 females and 5 males), NW

Atlantic, John U. Lloyd State Park, Whiskey Creek, Dania Beach, Florida (FL), tidal creek draining mangrove habitat running parallel to beach, 26°05'N, 80°06'W, 0.5 m depth; 3 males and 2 females ( USNM 107021 ), Alligator Harbor , Franklin County, FL, littoral sand–mud bar, 6 June, 1960, coll. & ident. C.E. King; several adult males and females were examined in the following locations: Ft. Pierce, FL, 27°30'N, 80°20'W ; Long Key, FL, 24°49'N, 80°48'W; Tampa Bay , FL, 27°37.9'N, 82°39.4'W ; Panama City, FL, 30°09'N, 85°41'W; Horn Island , MS, 30°15'N, 88°43'W ; Petit Bois Island , MS, 30°12'N, 88°25'W .

Off shore sites (all from the MAFLA Outer Continental Shelf Study, Gulf of Mexico): Adult female with oostegites ( GCRL 2995), Station 2747, 27° 24.2' N, 84° 07.3' W, 74 m, medium fine sand, September 1977; 2 adult females and 1 adult male ( GCRL 3011 ) (4.2 mm TL, fig. 5), station 2640, 29° 43'29.3" N, 87° 54'30.3" W, 35 m, medium sand, September, 1977 ; 2 adult females and 2 adult males ( GCRL 3027 ), station 2104–05, 26° 25' N, 83° 23'00.8" W, 53 m, coarse sand, November, 1977 ; 1 male, 1 female, 2 juveniles ( GCRL 3018 ), station 2104–06, 26° 25' N, 83° 23'00.8" W, 53 m, coarse sand, November, 1977 ; 2 males ( GCRL 3033 ) station 2104–07, 26° 25' N, 83° 23'00.8" W, 53 m, coarse sand, august 8, 1977 ; 1 female, 4 males, 3 juveniles ( GCRL 3017 ), station 2104–08, 26° 25' N, 83° 23'00.8" W, 53 m, coarse sand, November, 1977 ; 6 females, 1 juvenile ( GCRL 3040 ), station 2104–10, 26° 25' N, 83° 23'00.8" W, 53 m, coarse sand, November, 1977 ; 2 females with oostegites ( GCRL 3035 ), station 2104–11, 26° 25' N, 83° 23'00.8" W, 53 m, coarse sand, November, 1977– Feb 1978 ; 1 male ( GCRL 3003 ), station 2104–G, 26° 25' N, 83° 23'00.8" W, 53 m, coarse sand, September, 1975 ; 1 female with oostegites 1 juvenile ( GCRL 3055 ), station 2207–3, 27° 57'00.4" N, 83° 09'00.3" W, 19 m, fine–very fine sand, November, 1977 ; 2 females ( GCRL 3030 ), station 2207–05, 27° 57'00.4" N, 83° 09'00.3" W, 19 m, fine–very fine sand, November, 1977 ; 4 juveniles ( GCRL 3031 ), station 2207–07, 27° 57'00.4" N, 83° 09'00.3" W, 19 m, fine–very fine sand, November, 1977 ; 2 males ( GCRL 3022 , station 2207–10, 27° 57'00.4" N, 83° 09'00.3" W, 19 m, fine–very fine sand, November, 1977 ; 1 juvenile ( GCRL 3009 ), station 2207–11, 27° 57'00.4" N, 83° 09'00.3" W, 19 m, fine–very fine sand, November, 1977 ; 1 ovigerous female ( GCRL 3039 ) station 2211–08, 27° 56'29.5" N, 83° 52'59.5" W, 43 m, coarse sand, February, 1978 ; 1 female with oostegites ( GCRL 3010 ), station 2316–J, 28° 42'00.3" N, 84° 20'00.7" W, 35 m, silty fine sand, November, 1977 ; 1 female with oostegites, 1 female with empty marsupium, 1 male, 3 juveniles ( GCRL 3007 ), station 2419–C, 29° 46'59.8" N, 84° 05'00.2" W, 10 m, medium fine sand ; 1 female with oostegites ( GCRL 2996 ), station 2419–D, 29° 46'59.8" N, 84° 05'00.2" W, 10 m, medium fine sand, February, 1975 ; 2 females, 1 male, 1 juvenile ( GCRL 3042 ), station 2419–E, 29° 46'59.8" N, 84° 05'00.2" W, 10 m, medium fine sand, February, 1975 ; 1 female with oostegites, 3 males, 1 juvenile ( GCRL 3020 ), station 2419–F, 29° 46'59.8" N, 84° 05'00.2" W, 10 m, medium fine sand, February, 1975 ; 1 ovigerous female ( GCRL 3058 ), station 2419–Z, 29° 46'59.8" N, 84° 05'00.2" W, 10 m, medium fine sand, February, 1975 ; 1 ovigerous female ( GCRL 3023 ), station 2423–A, 29° 37'00.8" N, 84° 17'00.2" W, 19 m, silty fine sand, 1975 ; 2 males ( GCRL 3057 ) station 2423–F, 29° 37'00.8" N, 84° 17'00.2" W, 19 m, silty fine sand,, September, 1977 ; 1 female with oostegites, 1 male ( GCRL 3034 ), station 2423–G, 29° 37'00.8" N, 84° 17'00.2" W, 19 m, silty fine sand, February, 1975 ; 1 male ( GCRL 3032 ), station 2423–H, 29° 37'00.8" N, 84° 17'00.2" W, 19 m, silty fine sand, 1976 ; 1 male, 1 juvenile ( GCRL 3014 ), station 2423–I , 29° 37'00.8" N, 84° 17'00.2" W, 19 m, silty fine sand, February, 1975; 1 juvenile ( GCRL 3004 ), station 2423–K, 29° 37'00.8" N, 84° 17'00.2" W, 19 m, silty fine sand ; 1 female with oostegites ( GCRL 3028 ) station 2424–B, 29° 13'00.7" N, 85° 00'01.4" W, 27 m, medium sand, 1976 ; 1 female ( GCRL 3021 ), station 2424–I , 29° 13'00.7" N, 85° 00'01.4" W, 27 m, medium sand, February, 1975; 1 male ( GCRL 3002 ), station 2426–E, 28° 57'59.4" N, 85° 23'00.2" W, 82 m, fine sand, 1975 ; 2 females with oostegites ( GCRL 3056 ) station 2528–C, 29° 54'58.6" N, 86° 04'58.5" W, 37 m, coarse sand ; 1 female with oostegites, 1 male ( GCRL 3006 ), station 2528–J, 29° 54'58.6" N, 86° 04'58.5" W, 37 m, coarse sand, February, 1978 ; 1 male ( GCRL 3029 ) station 2533–C, 29° 42'59.9" N, 85° 15'28.6" W, 67 m, coarse sand ; 1 female with oostegites ( GCRL 3038 ) station 2642–E, 29° 40.5' N, 87° 37' W, 36 m, medium sand ; 2 females, 2 juveniles ( GCRL 3008 ), station 2747–10, 27° 24.2' N, 84° 07.3' W, 74 m, medium fine sand, August, 1977 ; 4 males, 2 juveniles, 1 manca ( GCRL 3037 ), 2747–11 27° 24.2' N, 84° 07.3' W, 74 m, medium fine sand, August, 1977; 2 females ( GCRL 3036 ), station 2748–03, 27° 37.2' N, 83° 53.5' W, 50 m, coarse sand, November, 1977 ; 1 female with oostegites, 1 male ( GCRL 3025 ), station 2748–05, 27° 37.2' N, 83° 53.5' W, 50 m, coarse sand, August, 1977 ; 1 female, 1 male, 1 juvenile ( GCRL 3012 ), station 2748–06, 27° 37.2' N, 83° 53.5' W, 50 m, coarse sand, August, 1977 ; 1 female with oostegites, 1 male ( GCRL 3019 ), station 2748–06, 27° 37.2' N, 83° 53.5' W, 50 m, coarse sand, February, 1978 ; 2 juveniles ( GCRL 3041 ), station 2748–06, 27° 37.2' N, 83° 53.5' W, 50 m, coarse sand, November, 1978 ; 1 female ( GCRL 3026 ), station 2748–07, 27° 37.2' N, 83° 53.5' W, 50 m, coarse sand, August, 1977 ; 1 male ( GCRL 3026 ), station 2748–07, 27° 37.2' N, 83° 53.5' W, 50 m, coarse sand, November, 1977 ; 1 female ( GCRL 3024 ),station 2748–09, 27° 37.2' N, 83° 53.5' W, 50 m, 01'08.5" W, 36 m, fine sand ; 1 male ( GCRL 3016 ), station 2856–E, 29° 54'01.3" N, 87° 24'00.2" W, 30 m, fine sand ; 1 subadult male ( GCRL 3005 ), station 2856–F, 29° 54'01.3" N, 87° 24'00.2" W, 30 m, fine sand, September, 1977 ; 1 male ( GCRL 3015 ), station 2856–H, 29° 54'01.3" N, 87° 24'00.2" W, 30 m, fine sand, September, 1977 ; 1 male, 1 juvenile ( GCRL 3013 ), station 2856–J, 29° 54'01.3" N, 87° 24'00.2" W, 30 m, fine sand, September, 1977 .

Diagnosis. Antenna with third peduncle article having ventromedial and blunt triangular projection. Mandibular palp with terminal setulate seta shorter than others. Cheliped sexually dimorphic (male propodus more robust and differing cutting edge dentition).

Type locality. NW Atlantic, John U. Lloyd State Park, Whiskey Creek , Dania Beach, Florida (FL), tidal creek draining mangrove habitat running parallel to beach, 26°05'N, 80°06'W, 0.5 m depth .

Geographic distribution. NW Atlantic and eastern Gulf of Mexico, South Carolina to Mississippi, 0.5–82 m depth (Fig. 1, number 35; Figs. 81–82) .

Remarks. Guţu (2006) erected a new genus ( Alokalliapseudes ) to accommodate this species based on the sexual dimorphism of the chelipeds. The cladistic analyses showed that this character is not enough to justify the separate generic status of this species. Also, the discovery of an ‘offshore morph’ of this species (see below) blurs the sexual/nonsexual dichotomy.

Examination of material from the eastern GOM revealed the presence of a new ‘morph’ of Mesokalliapseudes macsweenyi which generally occurs in offshore sites and greater depths than the ‘coastal morph’ ( Drumm and Heard, 2010). The ‘offshore morph’ of M. macsweenyi can be distinguished from the ‘coastal morph’ most notably by differences in the male cheliped. The male cheliped propodus of the ‘coastal morph’ ( Fig. 92A ) is much more robust and is less than two times as long as broad (excluding fixed finger), while the propodus of the ‘offshore morph’ (Fig. 91E) is more than two times as long as broad. Also, the dactylus cutting edge of the ‘coastal morph’ does not have a medial tooth, as in the ‘offshore morph.’ The females of both forms seem to be nearly identical; however, the fixed finger cutting edge of the ‘coastal morph’ ( Fig. 92B ) has rarely been observed to possess a proximal tooth. In his unpublished Master’s thesis, McSweeny (1968) noticed that a small percentage of females possessed a tooth on the proximal third of the fixed finger cutting edge. We have examined numerous specimens of the ‘coastal morph’ throughout its range and have never seen this tooth on the fixed finger.

The female chela usually has a proximal tooth on the fixed finger cutting edge. This tooth can be large as in Fig. 91A, or smaller as in Fig. 91B. However, several females examined, especially ovigerous females, lacked this tooth as in Fig. 91C. One female with oostegites had a small setose tooth on the dactylus cutting edge (Fig. 91D).

The male chela can also vary to some degree. The terminal unguis of the fixed finger can either be normal (Fig. 91E) or reduced (Fig. 91F), causing the fixed finger to appear differently. Subadult males have a propodus shape as in the female (Fig. 91G).

The senior author recently examined the population genetic and phylogeographic structure of the ‘coastal morph’ throughout most of its range and discovered that significant genetic structure existed among the populations (Drumm and Kreiser, in press). This calls into question the status of “cosmopolitan” species such as Leptochelia dubia and Sinelobus stanfordi .

Figures

FIGURE 92. Mesokalliapseudes macsweenyi, coastal morph. A, chela of an adult male; B, chela of a female with oostegites.