Megalostrata Karsch, 1880

Bonaldo, Alexandre B., Galán-Sanchez, M. Antonio & García, Fabián, 2024, Advances on the taxonomy of Megalostrata Karsch, 1880 (Araneae, Corinnidae, Corinninae), with descriptions of two new species, Zootaxa 5458 (4), pp. 495-523 : 496-497

publication ID

https://doi.org/ 10.11646/zootaxa.5458.4.2

publication LSID

lsid:zoobank.org:pub:63B55CBA-8E31-4834-B43F-2BB8994BA956

DOI

https://doi.org/10.5281/zenodo.11547843

persistent identifier

https://treatment.plazi.org/id/DA2B87EE-576E-FFA1-FF4F-2D25C2C8FADA

treatment provided by

Plazi

scientific name

Megalostrata Karsch, 1880
status

 

Megalostrata Karsch, 1880 View in CoL

Megalostrata Karsch, 1880: 377 View in CoL ;

type species by monotypy, M. venifica Karsch, 1880 View in CoL [

synonymized with Megalostrata raptor (L. Koch, 1866) View in CoL by Bonaldo (2000)]. For a complete list of synonyms see Bonaldo (2000: 116).

Diagnosis. Megalostrata appears to be most closely related to Erendira Bonaldo, 2000 with which it shares a prolateral tegular process that is apical in relation to the embolus insertion ( Figs 3A, C View FIGURE 3 , 20A, B View FIGURE 20 , 22A, B View FIGURE 22 ; Bonaldo 2000: figs 110–113, 304, 314) and the epigynum with an unsclerotized dorsal vulval plate and highly modified posterior plate ( Figs 5C View FIGURE 5 , 8C View FIGURE 8 , 12C View FIGURE 12 , 22D View FIGURE 22 ; Bonaldo 2000: figs 309, 323). Erendira also have dimorphic chelicerae, being longer in males than in females, but the male chelicerae of Erendira are not as modified as in Megalostrata ( Figs 1 View FIGURE 1 , 2 View FIGURE 2 , 4A, C View FIGURE 4 , 15A, C View FIGURE 15 ; see also Bonaldo 2000: figs 303, 312). Representatives of Megalostrata are readily separated from those of Erendira by presenting porrect male chelicerae, with only two large retromarginal teeth ( Figs 2B View FIGURE 2 , 17B View FIGURE 17 ; Bonaldo 2000: fig. 303) (male chelicerae not porrect, with three to four unmodified retromarginal teeth in Erendira ), male palpal tegulum without a conductor and with a highly coiled spermatic duct ( Figs 3A, C View FIGURE 3 , 20 View FIGURE 20 , 22A, B View FIGURE 22 ) (hyaline conductor and uncoiled spermatic duct, with terminal portion adjacent to the second fold in Erendira , see Bonaldo 2000: figs 314, 320); female epigynum with posterior plate excavated medially, exposing the unsclerotized cuticle of the epigastric plate ( Figs 5C View FIGURE 5 , 6E View FIGURE 6 , 8C View FIGURE 8 , 9E View FIGURE 9 , 12C View FIGURE 12 , 13E View FIGURE 13 , 22D View FIGURE 22 , 24C View FIGURE 24 ) (posterior plate not medially excavated, with a pair of accessory lateral pockets in Erendira , see Bonaldo 2000: figs 317, 323). Species of Megalostrata also have a distinctive body color pattern, generally with contrasting stripes on the carapace, and yellowish-white and black patches or lines on the abdomen of both sexes, features that are easily visible in living specimens ( Fig. 1 View FIGURE 1 ).

Description. See Bonaldo (2000: 116).

Key to species of Megalostrata View in CoL

1 Males [Those of M. monistica ( Chamberlin, 1924) View in CoL , M. bruneri ( Bryant, 1936) View in CoL and M. pacifica spec. nov. unknown]....... 2

- Females............................................................................................. 4

2(1) Retrolateral tibial apophysis bifid ( Figs 3C, D View FIGURE 3 ; Bonaldo 2000: figs 310, 311)...... M. depicta (O. Pickard-Cambridge, 1895) View in CoL

- Retrolateral tibial apophysis entire ( Figs 3A, B View FIGURE 3 , 20A View FIGURE 20 , 22A, B View FIGURE 22 ; Bonaldo 2000: figs 304–306).......................... 3

3(2) Apex of tegular process rounded, devoid of teeth; embolus directed retro-basally ( Figs 3A, B View FIGURE 3 ; Bonaldo 2000: figs 304–306)................................................................................ M. raptor (L. Koch, 1866) View in CoL

- Apex of tegular process truncated, with small teeth; embolus directed retro-apically ( Figs 20 View FIGURE 20 , 22A, B View FIGURE 22 , 23A, B View FIGURE 23 )............................................................................................. M. paludosa spec. nov.

4(1) Secondary spermathecae elongated, tube-shaped ( Figs 5A, B View FIGURE 5 , 6A–D View FIGURE 6 , 8A, B View FIGURE 8 , 9A–D View FIGURE 9 ; Bonaldo 2000: fig. 309)............. 5

- Secondary spermathecae bulbous ( Figs 12A, B View FIGURE 12 , 13A–D View FIGURE 13 , 14C View FIGURE 14 , 22C, E View FIGURE 22 , 23C, D View FIGURE 23 , 24A, B View FIGURE 24 ).............................. 7

5(4) Secondary spermathecae oriented obliquely ( Figs 5A, B View FIGURE 5 , 6A–D View FIGURE 6 ; Bonaldo 2000: figs 308, 309)........................ 6

- Secondary spermathecae oriented longitudinally ( Figs 8A, B View FIGURE 8 , 9A–D View FIGURE 9 )........................... M. pacifica spec. nov.

6(5) Posterior atrium defined by a transversal anterior ridge at the level of copulatory openings ( Bonaldo 2000: fig. 308)....................................................................................... M. raptor (L. Koch, 1866) View in CoL

- Posterior atrium borders ill-defined, transversal anterior ridge absent ( Figs 5A, B View FIGURE 5 , 6A–D View FIGURE 6 )................................................................................................ M. depicta (O. Pickard-Cambridge, 1895) View in CoL

7(4) Copulatory openings wide, leading to long, curved anteriorly copulatory ducts; posterior margin of epigynal plate with a median invagination ( Figs 10C View FIGURE 10 , 12A View FIGURE 12 , 13A, C View FIGURE 13 )..................................... M. monistica ( Chamberlin, 1924) View in CoL

- Copulatory openings inconspicuous, copulatory ducts short; posterior margin of epigynal plate without median invagination ( Figs 14C View FIGURE 14 , 22C View FIGURE 22 )...................................................................................... 8

8(7) Primary spermathecae small (diameter near the atrium height), positioned anteriorly to posterior atrium ( Fig. 14C View FIGURE 14 )........................................................................................ M. bruneri ( Bryant, 1936) View in CoL

- Primary spermathecae large (diameter larger than the atrium height), positioned at the level of posterior atrium ( Figs 22C View FIGURE 22 , 23C View FIGURE 23 , 24A, B View FIGURE 24 )........................................................................... M. paludosa spec. nov.

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Corinnidae

Loc

Megalostrata Karsch, 1880

Bonaldo, Alexandre B., Galán-Sanchez, M. Antonio & García, Fabián 2024
2024
Loc

Megalostrata

Karsch, F. 1880: 377
1880
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